/*
 * contrib/btree_gist/btree_macaddr8.c
 */
#include "postgres.h"

#include "btree_gist.h"
#include "btree_utils_num.h"
#include "utils/builtins.h"
#include "utils/inet.h"

typedef struct
{
    macaddr8    lower;
    macaddr8    upper;
    /* make struct size = sizeof(gbtreekey16) */
} mac8KEY;

/*
** OID ops
*/
PG_FUNCTION_INFO_V1(gbt_macad8_compress);
PG_FUNCTION_INFO_V1(gbt_macad8_fetch);
PG_FUNCTION_INFO_V1(gbt_macad8_union);
PG_FUNCTION_INFO_V1(gbt_macad8_picksplit);
PG_FUNCTION_INFO_V1(gbt_macad8_consistent);
PG_FUNCTION_INFO_V1(gbt_macad8_penalty);
PG_FUNCTION_INFO_V1(gbt_macad8_same);


static bool
gbt_macad8gt(const void *a, const void *b, FmgrInfo *flinfo)
{
    return DatumGetBool(DirectFunctionCall2(macaddr8_gt, PointerGetDatum(a), PointerGetDatum(b)));
}
static bool
gbt_macad8ge(const void *a, const void *b, FmgrInfo *flinfo)
{
    return DatumGetBool(DirectFunctionCall2(macaddr8_ge, PointerGetDatum(a), PointerGetDatum(b)));
}

static bool
gbt_macad8eq(const void *a, const void *b, FmgrInfo *flinfo)
{
    return DatumGetBool(DirectFunctionCall2(macaddr8_eq, PointerGetDatum(a), PointerGetDatum(b)));
}

static bool
gbt_macad8le(const void *a, const void *b, FmgrInfo *flinfo)
{
    return DatumGetBool(DirectFunctionCall2(macaddr8_le, PointerGetDatum(a), PointerGetDatum(b)));
}

static bool
gbt_macad8lt(const void *a, const void *b, FmgrInfo *flinfo)
{
    return DatumGetBool(DirectFunctionCall2(macaddr8_lt, PointerGetDatum(a), PointerGetDatum(b)));
}


static int
gbt_macad8key_cmp(const void *a, const void *b, FmgrInfo *flinfo)
{
    mac8KEY    *ia = (mac8KEY *) (((const Nsrt *) a)->t);
    mac8KEY    *ib = (mac8KEY *) (((const Nsrt *) b)->t);
    int            res;

    res = DatumGetInt32(DirectFunctionCall2(macaddr8_cmp, Macaddr8PGetDatum(&ia->lower), Macaddr8PGetDatum(&ib->lower)));
    if (res == 0)
        return DatumGetInt32(DirectFunctionCall2(macaddr8_cmp, Macaddr8PGetDatum(&ia->upper), Macaddr8PGetDatum(&ib->upper)));

    return res;
}


static const gbtree_ninfo tinfo =
{
    gbt_t_macad8,
    sizeof(macaddr8),
    16,                            /* sizeof(gbtreekey16) */
    gbt_macad8gt,
    gbt_macad8ge,
    gbt_macad8eq,
    gbt_macad8le,
    gbt_macad8lt,
    gbt_macad8key_cmp,
    NULL
};


/**************************************************
 * macaddr ops
 **************************************************/



static uint64
mac8_2_uint64(macaddr8 *m)
{
    unsigned char *mi = (unsigned char *) m;
    uint64        res = 0;
    int            i;

    for (i = 0; i < 8; i++)
        res += (((uint64) mi[i]) << ((uint64) ((7 - i) * 8)));
    return res;
}



Datum
gbt_macad8_compress(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);

    PG_RETURN_POINTER(gbt_num_compress(entry, &tinfo));
}

Datum
gbt_macad8_fetch(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);

    PG_RETURN_POINTER(gbt_num_fetch(entry, &tinfo));
}

Datum
gbt_macad8_consistent(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
    macaddr8   *query = (macaddr8 *) PG_GETARG_POINTER(1);
    StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);

    /* Oid        subtype = PG_GETARG_OID(3); */
    bool       *recheck = (bool *) PG_GETARG_POINTER(4);
    mac8KEY    *kkk = (mac8KEY *) DatumGetPointer(entry->key);
    GBT_NUMKEY_R key;

    /* All cases served by this function are exact */
    *recheck = false;

    key.lower = (GBT_NUMKEY *) &kkk->lower;
    key.upper = (GBT_NUMKEY *) &kkk->upper;

    PG_RETURN_BOOL(
                   gbt_num_consistent(&key, (void *) query, &strategy, GIST_LEAF(entry), &tinfo, fcinfo->flinfo)
        );
}


Datum
gbt_macad8_union(PG_FUNCTION_ARGS)
{
    GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
    void       *out = palloc0(sizeof(mac8KEY));

    *(int *) PG_GETARG_POINTER(1) = sizeof(mac8KEY);
    PG_RETURN_POINTER(gbt_num_union((void *) out, entryvec, &tinfo, fcinfo->flinfo));
}


Datum
gbt_macad8_penalty(PG_FUNCTION_ARGS)
{
    mac8KEY    *origentry = (mac8KEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(0))->key);
    mac8KEY    *newentry = (mac8KEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(1))->key);
    float       *result = (float *) PG_GETARG_POINTER(2);
    uint64        iorg[2],
                inew[2];

    iorg[0] = mac8_2_uint64(&origentry->lower);
    iorg[1] = mac8_2_uint64(&origentry->upper);
    inew[0] = mac8_2_uint64(&newentry->lower);
    inew[1] = mac8_2_uint64(&newentry->upper);

    penalty_num(result, iorg[0], iorg[1], inew[0], inew[1]);

    PG_RETURN_POINTER(result);

}

Datum
gbt_macad8_picksplit(PG_FUNCTION_ARGS)
{
    PG_RETURN_POINTER(gbt_num_picksplit(
                                        (GistEntryVector *) PG_GETARG_POINTER(0),
                                        (GIST_SPLITVEC *) PG_GETARG_POINTER(1),
                                        &tinfo, fcinfo->flinfo
                                        ));
}

Datum
gbt_macad8_same(PG_FUNCTION_ARGS)
{
    mac8KEY    *b1 = (mac8KEY *) PG_GETARG_POINTER(0);
    mac8KEY    *b2 = (mac8KEY *) PG_GETARG_POINTER(1);
    bool       *result = (bool *) PG_GETARG_POINTER(2);

    *result = gbt_num_same((void *) b1, (void *) b2, &tinfo, fcinfo->flinfo);
    PG_RETURN_POINTER(result);
}
